package timing.ukulele.navigation;

import java.net.URL;

import org.apache.pivot.beans.Bindable;
import org.apache.pivot.collections.Map;
import org.apache.pivot.collections.Sequence;
import org.apache.pivot.util.Resources;
import org.apache.pivot.util.Vote;
import org.apache.pivot.wtk.Accordion;
import org.apache.pivot.wtk.AccordionSelectionListener;
import org.apache.pivot.wtk.Component;
import org.apache.pivot.wtk.Window;

public class Accordions extends Window implements Bindable {
    private Accordion accordion = null;

    @Override
    public void initialize(Map<String, Object> namespace, URL location, Resources resources) {
        accordion = (Accordion) namespace.get("accordion");
        accordion.getAccordionSelectionListeners().add(new AccordionSelectionListener() {
            private int selectedIndex = -1;

            @Override
            public Vote previewSelectedIndexChange(Accordion accordion, int selectedIndex) {
                this.selectedIndex = selectedIndex;

                // Enable the next panel or disable the previous panel so the
                // transition looks smoother
                if (selectedIndex != -1) {
                    int previousSelectedIndex = accordion.getSelectedIndex();
                    if (selectedIndex > previousSelectedIndex) {
                        accordion.getPanels().get(selectedIndex).setEnabled(true);
                    } else {
                        accordion.getPanels().get(previousSelectedIndex).setEnabled(false);
                    }

                }

                return Vote.APPROVE;
            }

            @Override
            public void selectedIndexChangeVetoed(Accordion accordion, Vote reason) {
                if (reason == Vote.DENY
                        && selectedIndex != -1) {
                    Component panel = accordion.getPanels().get(selectedIndex);
                    panel.setEnabled(!panel.isEnabled());
                }
            }

            @Override
            public void selectedIndexChanged(Accordion accordion, int previousSelection) {
                updateAccordion();
            }
        });

        updateAccordion();
    }

    private void updateAccordion() {
        int selectedIndex = accordion.getSelectedIndex();

        Sequence<Component> panels = accordion.getPanels();
        for (int i = 0, n = panels.getLength(); i < n; i++) {
            panels.get(i).setEnabled(i <= selectedIndex);
        }
    }
}
